ShaderChunk: Bring gl_FrontFacing back #21205
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This was referenced Feb 4, 2021
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Related issue: #21202 #21203
Description
Plot twist! Turns out the Adreno bug is only when gl_FrontFacing is inside a function. After today's refactoring we only refer to it in
main()so we can now bring it back and get rid of the workaround.